# Counties in Iowa by population density, 2025

All 99 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population_density`
- Unit: inhabitants per km²
- Definition: Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.
- Source: U.S. Census Bureau, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km² (https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/)
- Retrieved: 2026-10-09
- Citation: U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.
- Web page: https://invokely.ai/rankings/population-density/iowa-counties
- CSV: https://invokely.ai/download/rankings/population-density/iowa-counties.csv

| Rank | Place | inhabitants per km² |
|---:|---|---:|
| 1 | Polk County | 348.2 |
| 2 | Scott County | 147.7 |
| 3 | Linn County | 124.9 |
| 4 | Johnson County | 100.8 |
| 5 | Black Hawk County | 89.8 |
| 6 | Dallas County | 77.8 |
| 7 | Story County | 68.3 |
| 8 | Dubuque County | 63.1 |
| 9 | Woodbury County | 47.2 |
| 10 | Warren County | 38.9 |
| 11 | Pottawattamie County | 37.7 |
| 12 | Muscatine County | 36.9 |
| 13 | Des Moines County | 35.3 |
| 14 | Wapello County | 31.5 |
| 15 | Cerro Gordo County | 28.8 |
| 16 | Marshall County | 26.9 |
| 17 | Clinton County | 25.6 |
| 18 | Lee County | 24.1 |
| 19 | Marion County | 23.8 |
| 20 | Bremer County | 22.4 |
| 21 | Jasper County | 20.2 |
| 22 | Webster County | 19.9 |
| 23 | Sioux County | 18.5 |
| 24 | Dickinson County | 18.3 |
| 25 | Boone County | 18.1 |
| 26 | Henry County | 17.2 |
| 27 | Washington County | 15.4 |
| 28 | Mahaska County | 14.8 |
| 29 | Jones County | 14.3 |
| 30 | Buchanan County | 14.1 |
| 31 | Benton County | 14 |
| 32 | Carroll County | 13.8 |
| 33 | Buena Vista County | 13.7 |
| 34 | Jefferson County | 13.6 |
| 35 | Mills County | 13.1 |
| 36 | Cedar County | 12.2 |
| 37 | Poweshiek County | 12.1 |
| 38 | Madison County | 11.9 |
| 39 | Delaware County | 11.8 |
| 40 | Jackson County | 11.7 |
| 41 | Plymouth County | 11.5 |
| 42 | Floyd County | 11.5 |
| 43 | Hardin County | 11.2 |
| 44 | Winneshiek County | 11 |
| 45 | Clay County | 11 |
| 46 | Iowa County | 10.9 |
| 47 | Union County | 10.8 |
| 48 | Page County | 10.7 |
| 49 | Fayette County | 10.1 |
| 50 | Louisa County | 10 |
| 51 | Hamilton County | 10 |
| 52 | Winnebago County | 9.9 |
| 53 | O'Brien County | 9.6 |
| 54 | Grundy County | 9.5 |
| 55 | Appanoose County | 9.4 |
| 56 | Butler County | 9.4 |
| 57 | Montgomery County | 9.1 |
| 58 | Tama County | 9 |
| 59 | Chickasaw County | 8.9 |
| 60 | Emmet County | 8.9 |
| 61 | Cass County | 8.9 |
| 62 | Crawford County | 8.8 |
| 63 | Mitchell County | 8.8 |
| 64 | Allamakee County | 8.6 |
| 65 | Clarke County | 8.6 |
| 66 | Wright County | 8.5 |
| 67 | Humboldt County | 8.4 |
| 68 | Clayton County | 8.4 |
| 69 | Lyon County | 8.1 |
| 70 | Harrison County | 8.1 |
| 71 | Lucas County | 7.9 |
| 72 | Howard County | 7.7 |
| 73 | Shelby County | 7.6 |
| 74 | Cherokee County | 7.6 |
| 75 | Hancock County | 7.1 |
| 76 | Davis County | 7.1 |
| 77 | Worth County | 7.1 |
| 78 | Guthrie County | 7 |
| 79 | Monroe County | 6.6 |
| 80 | Franklin County | 6.5 |
| 81 | Keokuk County | 6.5 |
| 82 | Calhoun County | 6.5 |
| 83 | Sac County | 6.4 |
| 84 | Palo Alto County | 6.1 |
| 85 | Ida County | 6.1 |
| 86 | Greene County | 5.9 |
| 87 | Osceola County | 5.8 |
| 88 | Kossuth County | 5.7 |
| 89 | Van Buren County | 5.7 |
| 90 | Decatur County | 5.6 |
| 91 | Adair County | 5 |
| 92 | Wayne County | 5 |
| 93 | Fremont County | 4.9 |
| 94 | Audubon County | 4.8 |
| 95 | Monona County | 4.8 |
| 96 | Pocahontas County | 4.6 |
| 97 | Taylor County | 4.2 |
| 98 | Ringgold County | 3.3 |
| 99 | Adams County | 3.3 |